ok i'm in platina in phase 1 and have to download the purger in one misha or aurica, i wanted to chose aurica but i cannot choose her ! SHITi dunno why, i completed level 4 cosmosphere & misha is level 5. i cannot make level 5 with aurica cause 1 topic for it is missing, can i get one with fighting etc.?

what can i do to make her available?i have no savegame to go back to the lower world.